A beautiful, original 145.012 cal. 321 like the one I fell in love with

Well where you can look depends on where you are. If you are willing to pay, then Paris is a good place.

For some reason the -68 seems less common than the -67, but prices do not vary because of this.

Chrono 24 is expensive and riddled with over prepared trade watches, often incorrect and unattractive.

Most Speedmasters coming onto the market on eBay have something that a collector would want to improve. Such as changing the bezel or even hands. Certainly it will need a service. But it is the way many of my watches were acquired, and many others here will have done so too.

Boxes are rarely original. Papers are interesting, but frankly some are fake. For me B&P's are a red herring except in extremely rare circumstances. For example backing up a claim from a family member that the watch was bought new. I reckon many sets on the market have been assembled.

I would rather buy a family owned watch off ebay, and spend $1000-2000 on it than buy a married set off a European internet seller.

When you say ready to pay, a Paris dealer might well have what you say you want, for about €9000. And I don't make critism of a bricks and mortar shop charging this if, and it's a big if, the watch is absolutely correct and good.

Not one of mine cost more than half that, and I prefer them. Buying a vintage watch is not about the money. If it was, anyone could find one. A succesful buyer has, as you say, patience, but also knowledge, taste, and confidence to act quickly when the right watch comes along.

I wish you every success. Remember....you may end up buying more than one, and choosing which one to keep!